{
   # memory limit to catch any memory leak before it kills the system
   use constant MIN_MEMORY_LIMIT => 100000000;
   
   # If there is a memory limit in the database and it is below the minimum, delete it. 
   if (defined $pppoe{Mlimit} && $pppoe{Mlimit} < MIN_MEMORY_LIMIT)
   {
      $DB->get_prop_and_delete('pppoe','Mlimit');
      delete $pppoe{Mlimit};
   }
   
   $OUT = "PPPD_MLIMIT=";
   $OUT .= $pppoe{Mlimit} || MIN_MEMORY_LIMIT;
}